chore(filelib-web): 左栏加「教研数据库」标题,用户身份+退出移至栏底,顶栏去掉身份区

hub/filelib-web/src/lib/GridLibraryView.svelte

@@ -11,7 +11,6 @@
   import { onMount } from "svelte";
   import { api } from "./api.js";
   import { me, toastErr, toastOk } from "./stores.js";
-  import { logout } from "./session.js";
   import { selectedFilePath, clearSelectedFile } from "./browser.js";
   import { ROLE_LABEL } from "./labels.js";
   import type { FileEntry, NodeChild, NodeDetail, Role } from "./types.js";
@@ -61,7 +60,6 @@
     currentFolder === null ? ($me?.isWebsiteAdmin ?? false) : atLeast(currentFolder.role, "EDIT"),
   );
   const projectCanEdit = $derived(projectNode !== null && projectNode.role !== "VIEW");
-  const initial = $derived(($me?.displayName ?? $me?.userId ?? "U").slice(0, 1).toUpperCase());
 
   /* ------------------------------------------------------------ 数据加载 */
 
@@ -387,16 +385,6 @@
       </button>
     {/if}
     <button class="btn btn-sm" onclick={refresh} title="刷新"><Icon name="refresh" size={13} /></button>
-
-    <div class="ml-1 flex shrink-0 items-center gap-2 border-l border-line-soft pl-3">
-      <span class="flex h-6 w-6 items-center justify-center rounded-full bg-accent text-[11px] font-semibold text-white">{initial}</span>
-      <span class="max-w-[120px] truncate text-[12.5px] text-ink">{$me?.displayName ?? $me?.userId ?? ""}</span>
-      <button
-        class="rounded-lg border border-line-soft px-2 py-1 text-[11.5px] text-ink-3 transition hover:bg-hover hover:text-ink"
-        onclick={logout}
-        title="退出登录"
-      >退出</button>
-    </div>
   </header>
 
   <!-- 主体:网格 + 文件预览栏 -->

hub/filelib-web/src/routes/app/+page.svelte

@@ -2,7 +2,7 @@
   /** 老师端。未登录显示登录卡片;登录后是带左栏导航的文件库(ADR-0031)。 */
   import { onMount } from "svelte";
   import { me, authChecked } from "$lib/stores.js";
-  import { loadSession } from "$lib/session.js";
+  import { loadSession, logout } from "$lib/session.js";
   import LoginView from "$lib/LoginView.svelte";
   import GridLibraryView from "$lib/GridLibraryView.svelte";
   import BinView from "$lib/BinView.svelte";
@@ -17,16 +17,23 @@
     ["library", "文件库", "layers"],
     ["bin", "回收站", "trash"],
   ];
+
+  const initial = $derived(($me?.displayName ?? $me?.userId ?? "U").slice(0, 1).toUpperCase());
 </script>
 
-<svelte:head><title>文件库</title></svelte:head>
+<svelte:head><title>教研数据库</title></svelte:head>
 
 {#if !$authChecked}
   <div class="flex h-full items-center justify-center text-ink-3">加载中…</div>
 {:else if $me}
   <div class="flex h-full">
     <!-- 左栏导航(ADR-0031) -->
-    <nav class="flex w-[168px] shrink-0 flex-col gap-0.5 border-r border-line-soft bg-sidebar px-2.5 py-3.5">
+    <nav class="flex w-[168px] shrink-0 flex-col border-r border-line-soft bg-sidebar px-2.5 py-3.5">
+      <!-- 标题 -->
+      <div class="mb-3 px-2 text-[15px] font-bold text-ink">教研数据库</div>
+
+      <!-- 导航项 -->
+      <div class="flex flex-1 flex-col gap-0.5">
         {#each tabs as [id, label, icon] (id)}
           <button
             class="flex items-center gap-2.5 rounded-lg px-3 py-2 text-left text-[13px] transition {view === id
@@ -38,6 +45,18 @@
             {label}
           </button>
         {/each}
+      </div>
+
+      <!-- 底部:用户身份 + 退出 -->
+      <div class="mt-auto flex items-center gap-2 border-t border-line-soft pt-3">
+        <span class="flex h-6 w-6 shrink-0 items-center justify-center rounded-full bg-accent text-[11px] font-semibold text-white">{initial}</span>
+        <span class="min-w-0 flex-1 truncate text-[12.5px] text-ink">{$me?.displayName ?? $me?.userId ?? ""}</span>
+        <button
+          class="rounded-lg border border-line-soft px-2 py-1 text-[11.5px] text-ink-3 transition hover:bg-hover hover:text-ink"
+          onclick={logout}
+          title="退出登录"
+        >退出</button>
+      </div>
     </nav>
 
     {#if view === "library"}